103 lines
3.1 KiB
C#
103 lines
3.1 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using System.IO;
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using System.Security.Cryptography;
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using UnityEngine;
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using UnityEngine.Networking;
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public static class VRCCachedWWW {
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public const float DefaultCacheTimeHours = 24 * 7;
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public static void ClearOld(float cacheLimitHours = DefaultCacheTimeHours)
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{
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string cacheDir = CacheDir;
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if (System.IO.Directory.Exists(cacheDir))
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{
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foreach (string fileName in System.IO.Directory.GetFiles(cacheDir))
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{
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if (GetAge(fileName) > cacheLimitHours)
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{
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Debug.Log($"Deleting {fileName}");
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System.IO.File.Delete(fileName);
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}
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}
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}
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}
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private static string CacheDir
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{
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get
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{
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return Application.temporaryCachePath;
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}
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}
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public static IEnumerator Get(string url, System.Action<Texture2D> onDone, float cacheLimitHours = DefaultCacheTimeHours)
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{
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string cacheDir = CacheDir;
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if (!System.IO.Directory.Exists(cacheDir))
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System.IO.Directory.CreateDirectory(cacheDir);
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string hash = CreateHash(url);
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string cache = cacheDir + "/www_" + hash;
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if (File.Exists(cache))
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{
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// Use cached file if it exists
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if (GetAge(cache) > cacheLimitHours)
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File.Delete(cache);
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else
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{
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var texture = new Texture2D(2, 2);
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if (texture.LoadImage(File.ReadAllBytes(cache)))
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{
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// load texture from disk and exit if we successfully read it
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texture.Apply();
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onDone(texture);
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yield break;
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}
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}
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}
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else
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{
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// No cached file, load it from url
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using (UnityWebRequest uwr = UnityWebRequestTexture.GetTexture(url))
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{
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// Wait until request and download are complete
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yield return uwr.SendWebRequest();
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while (!uwr.isDone || !uwr.downloadHandler.isDone)
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{
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yield return null;
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}
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var texture = DownloadHandlerTexture.GetContent(uwr);
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if(string.IsNullOrEmpty(uwr.error))
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File.WriteAllBytes(cache, uwr.downloadHandler.data);
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onDone(texture);
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yield break;
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}
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}
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}
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private static string CreateHash(string _string)
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{
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SHA256 hash = SHA256.Create();
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byte[] computed_hash = hash.ComputeHash(System.Text.Encoding.Default.GetBytes(_string));
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return System.Uri.EscapeDataString(System.Convert.ToBase64String(computed_hash));
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}
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private static double GetAge(string file)
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{
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if (!System.IO.File.Exists(file))
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return 0;
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System.DateTime writeTime = System.IO.File.GetLastWriteTimeUtc(file);
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return System.DateTime.UtcNow.Subtract(writeTime).TotalHours;
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}
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}
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